Int 2F Fn 4A10  CU - Smartdrv V4.00+ - Check If Drive Cacheable            [c]

   AX = 4A10h
   BX = 0006h
   CL = drive number (01h = A:)

Return: AX = 0006h if drive should not be cached by SMARTDRV

Note:  called by SMARTDRV at startup to determine whether it should cache
     a particular drive

See Also: AX=4A10h/BX=0000h